WAEC - Chemistry (2008 - No. 19)
When concentrated \(H_2SO_4\) is added to NaCI (s), the gas evolved
bleaches damp blue litmus paper
forms a white preciptate with AgNO3(aq)
forms a white precipitate with BaCI2(aq)
turns moist red litmus paper blue
คำอธิบาย
2\(NaCl_{(aq)} + H_2SO_{4(aq)} → Na_2SO_{4(aq)} + 2HCl_{(g)}\)
This gas(hydrochloride gas) turns damp/moist blue litmus paper red while reacting with \(AgNO_{3(aq)}\), a white precipitate of AgCl is produced which is soluble in ammonia solution but insoluble in \(HNO_3\)